Copied from:
https://github.com/openwrt/openwrt/blob/58a95f0f8ff768b43d68eed2b6a786e0f40f723b/tools/e2fsprogs/patches/005-misc-rename-copy_file_range-to-copy_file_chunk.patch

From 01551bdba16ab16512a01affe02ade32c41ede8a Mon Sep 17 00:00:00 2001
From: Palmer Dabbelt <palmer@dabbelt.com>
Date: Fri, 29 Dec 2017 10:19:51 -0800
Subject: [PATCH] misc: rename copy_file_range to copy_file_chunk

As of 2.27, glibc will have a copy_file_range library call to wrap the
new copy_file_range system call.  This conflicts with the function in
misc/create_inode.c, which this patch renames _copy_file_range.

Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---
 misc/create_inode.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/misc/create_inode.c
+++ b/misc/create_inode.c
@@ -392,7 +392,7 @@ static ssize_t my_pread(int fd, void *bu
 }
 #endif /* !defined HAVE_PREAD64 && !defined HAVE_PREAD */
 
-static errcode_t copy_file_range(ext2_filsys fs, int fd, ext2_file_t e2_file,
+static errcode_t copy_file_chunk(ext2_filsys fs, int fd, ext2_file_t e2_file,
 				 off_t start, off_t end, char *buf,
 				 char *zerobuf)
 {
@@ -466,7 +466,7 @@ static errcode_t try_lseek_copy(ext2_fil
 
 		data_blk = data & ~(fs->blocksize - 1);
 		hole_blk = (hole + (fs->blocksize - 1)) & ~(fs->blocksize - 1);
-		err = copy_file_range(fs, fd, e2_file, data_blk, hole_blk, buf,
+		err = copy_file_chunk(fs, fd, e2_file, data_blk, hole_blk, buf,
 				      zerobuf);
 		if (err)
 			return err;
@@ -516,7 +516,7 @@ static errcode_t try_fiemap_copy(ext2_fi
 		}
 		for (i = 0, ext = ext_buf; i < fiemap_buf->fm_mapped_extents;
 		     i++, ext++) {
-			err = copy_file_range(fs, fd, e2_file, ext->fe_logical,
+			err = copy_file_chunk(fs, fd, e2_file, ext->fe_logical,
 					      ext->fe_logical + ext->fe_length,
 					      buf, zerobuf);
 			if (err)
@@ -569,7 +569,7 @@ static errcode_t copy_file(ext2_filsys f
 		goto out;
 #endif
 
-	err = copy_file_range(fs, fd, e2_file, 0, statbuf->st_size, buf,
+	err = copy_file_chunk(fs, fd, e2_file, 0, statbuf->st_size, buf,
 			      zerobuf);
 out:
 	ext2fs_free_mem(&zerobuf);
